$(document).ready(function() 
{
    
    $("#select_center").multiSelect("#select_left", {trigger: "#center-left"});
    $("#select_left").multiSelect("#select_center", {trigger: "#left-center"});
    
    $("#select_center").multiSelect("#select_right", {trigger: "#center-right"});
    $("#select_right").multiSelect("#select_center", {trigger: "#right-center"});
    
});